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It is important to minimize power loss in the waveguide system connecting klystron, pulse-compressor, and accelerator in an X-Band NLC. However, existing designs of klystron output cavity circuits and accelerator input couplers utilize rectangular waveguide which has relatively high transmission loss. It is therefore necessary to convert to and from the low-loss mode in circular waveguide at each end of the system. A description is given of development work on high-power, high-vacuum 'flower-petal' transducers, which convert the TEto mode in rectangular guide to the ml mode in circular guide. A threeport modification of the flower petal device, which can be used as either a power combiner at the klystron or a power divider at the accelerator is also described.

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